file_write: Kill non-btr code.
[paraslash.git] / file_write.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file file_write.c simple output plugin for testing purposes */
8
9 #include <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include <sys/time.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "write.h"
21 #include "write_common.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "file_write.cmdline.h"
25 #include "error.h"
26
27 /** data specific to the file writer */
28 struct private_file_write_data {
29 /** the file descriptor of the output file */
30 int fd;
31 /** non-zero if \a fd was added to the write fd set */
32 int check_fd;
33 };
34
35 /*
36 * Get a random filename.
37 *
38 * This is by no means a secure way to create temporary files in a hostile
39 * directory like \p /tmp. However, we use it only for creating temp files in
40 * ~/.paraslash, for which it is OK. Result must be freed by the caller.
41 */
42 __must_check __malloc static char *random_filename(void)
43 {
44 char *result, *home = para_homedir();
45 struct timeval tv;
46
47 gettimeofday(&tv, NULL);
48 srandom(tv.tv_usec);
49 result = make_message("%s/.paraslash/%08lu", home,
50 para_random(99999999));
51 free(home);
52 return result;
53 }
54
55 static int file_write_open(struct writer_node *wn)
56 {
57 struct private_file_write_data *pfwd = para_calloc(
58 sizeof(struct private_file_write_data));
59 struct file_write_args_info *conf = wn->conf;
60 char *filename;
61
62 if (conf->filename_given)
63 filename = conf->filename_arg;
64 else
65 filename = random_filename();
66 wn->private_data = pfwd;
67 pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
68 if (!conf->filename_given)
69 free(filename);
70 if (pfwd->fd >= 0)
71 return 1;
72 free(pfwd);
73 return -E_FW_OPEN;
74 }
75
76 static void file_write_pre_select_btr(struct sched *s, struct task *t)
77 {
78 struct writer_node *wn = container_of(t, struct writer_node, task);
79 struct private_file_write_data *pfwd = wn->private_data;
80 int ret;
81
82 t->error = 0;
83 pfwd->check_fd = 0;
84 ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
85 if (ret > 0) {
86 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
87 pfwd->check_fd = 1;
88 } else if (ret < 0) {
89 s->timeout.tv_sec = 0;
90 s->timeout.tv_usec = 1;
91 }
92 }
93
94 static void file_write_close(struct writer_node *wn)
95 {
96 struct private_file_write_data *pfwd = wn->private_data;
97
98 close(pfwd->fd);
99 free(pfwd);
100 }
101
102 static void file_write_post_select_btr(__a_unused struct sched *s,
103 struct task *t)
104 {
105 struct writer_node *wn = container_of(t, struct writer_node, task);
106 struct private_file_write_data *pfwd = wn->private_data;
107 struct btr_node *btrn = wn->btrn;
108 int ret;
109 char *buf;
110 size_t bytes;
111
112 t->error = 0;
113 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
114 if (ret == 0)
115 return;
116 if (ret < 0)
117 goto err;
118 if (!pfwd->check_fd)
119 return;
120 if (!FD_ISSET(pfwd->fd, &s->wfds))
121 return;
122 bytes = btr_next_buffer(btrn, &buf);
123 assert(bytes > 0);
124 //PARA_INFO_LOG("writing %zu\n", bytes);
125 ret = write(pfwd->fd, buf, bytes);
126 if (ret < 0)
127 goto err;
128 btr_consume(btrn, ret);
129 return;
130 err:
131 assert(ret < 0);
132 t->error = ret;
133 btr_remove_node(btrn);
134 }
135
136 __malloc static void *file_write_parse_config(const char *options)
137 {
138 struct file_write_args_info *conf
139 = para_calloc(sizeof(struct file_write_args_info));
140 int ret = file_cmdline_parser_string(options, conf, "file_write");
141
142 PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
143 if (!ret)
144 return conf;
145 free(conf);
146 return NULL;
147 }
148
149 static void file_write_free_config(void *conf)
150 {
151 file_cmdline_parser_free(conf);
152 }
153
154 /** the init function of the file writer */
155 void file_write_init(struct writer *w)
156 {
157 struct file_write_args_info dummy;
158
159 file_cmdline_parser_init(&dummy);
160 w->open = file_write_open;
161 w->pre_select_btr = file_write_pre_select_btr;
162 w->post_select_btr = file_write_post_select_btr;
163 w->parse_config = file_write_parse_config;
164 w->free_config = file_write_free_config;
165 w->close = file_write_close;
166 w->shutdown = NULL; /* nothing to do */
167 w->help = (struct ggo_help) {
168 .short_help = file_write_args_info_help,
169 .detailed_help = file_write_args_info_detailed_help
170 };
171 file_cmdline_parser_free(&dummy);
172 }